Back in the 90s, these didn't work for me. I can see them nowadays, but they're backwards for me. Instead of a 3D object jumping out, I see a block with a recessed shape in it, like the mould of what I should be seeing. Fine for big solid objects, but not so good if there's any fine detail in it.

I can only conclude that I have my eyes in the wrong way round.

Everyone knows photographers make up the hottest proportions of Britains single men. - Kater